Rock-drill.



L. w. GRB B.

ROCK DRILL.

APPLICATION FILED AUG. 12, 1913.

Patented June 16, 1914.

2 SHEETSSHEBT l.

INVENTOR WITNESSES 4 2}, I MM 3 L. Wx GREVE.

ROCK DRILL.

APPLICATION FILED AUG. 12, 19161 0 Ms. 0 km w h *w an n h 1 1 WWW H a A W ll M W i 1 mm 1 m A We M MW Q0 HWW IWH I 2 SHEETS-SHEBT 2.

Patented June 16, 1914.

TITED STATES PATENT OFFICE LOUIS W. GREVE, 0F CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE CLEVELAND ROCK DRILL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

ROCK-DRILL.

To (1% whom it may concern:

Be it known that I, LOUIS W. GREVE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification.

The invention relates to rock drills, and particularly to the means for securing a step-by-step rotation of the chuck and drill steel. It has for its primary objects: the provision of improved and simplified means for accomplishing the purpose above specified; the provision of a construction in which the stepby-step movement is secured in a positive manner by means of great durability, and having a minimum number of parts easily assembled and not liable to get out of order; the provision of improved means for securing the stoppage of the harm mer piston; the provision of an arrangement whereby the drill can be operated close to a side wall when desired; and the provision of improved means for securing a yielding support of the front end member of the drill casing and preventin the accidental unscrewing of the longitudinally-extending securing bolts or their nuts. One embodiment of the invention is illustrated in the accompanying drawing wherein:

Figure 1 a longitudinal section through the forward portion of the drill; Fig. 2 is a transverse section on the line IIII of Fig. 1; Fig. a face view of the ratchet wheel which encircles the chuck; Fig. 4: is

an end view of the chuck; Fig. 5 is a longitudinal section through the entire drilling apparatus; Fig. 6 is a plan View of. the front end of the drill of Fig. 5; and Fig. 7 is a rear end view of: the drill of Fig. 5.

Referring to the drawings, 1 is the body portion or casing of the drill; 2 is the hammer piston; 23 is the anvil; 4 is a transversely moving piston for supplying the power for the stcp-hy-step rotation of the drill steel to he later dcscrihed; and 5 is the valve for controlling the rcciprocaiory movement of the piston 4. The foregoing parts may be constructed in a variety of ways, such parts all being old in the art, and

constituting no part of the present inven-v tion. The reciprocation of the piston 4 controlled by the valve 5 is secured by the admission of fluid pressure through the pas- Specification of Letters Patent.

Application filed August 12, 1913.

Patented J 11110 16, 1914.

Serial No. 784,359.

sage 6 leading to the rear portion of the device under the control of the operator.

Mounted in the front portion of the drill casing is the chuck 7 yieldingly held in its forward position by means of the coil spring 8 bearing against the collar 9 integral with the chuck. By reference to Fig. 1 it will be seen that the chuck is provided with a longitudinal passage 10 angular in cross section, to slidably receive the drill steel 11, and provided with the laterally projecting lugs 12.

Mounted slidably upon the exterior of the chuck is theannular ratchet wheel 13, such ratchet wheel being provided upon its face with teeth 14, and having projecting from the opposite side, the lugs 15 which lie vctwecn the lugs 12 on the chuck, so that when the ratchet wheel is rotated the chuck is caused to rotate.

Also mounted upon the chuck, to the rear of the ratchet Wheel 13, is the pawl 16. This pawl is concave upon its lower side, so as to fit the upper surface of the chuck, and has projecting from its upper side a lug 17 (Fig. 2). This lug fits into a recess on the under side of the piston 4, so that when the piston is reciprocated the pawl is oscillated. The pawl is held against movement to the left by means of the collar 18, and its teeth are caused to be yieldingly engaged by the teeth of theratchet wheel 13, by reason of the spring 8 which presses at its rear end against the washer 19 hearing against the ends of the lugs 15. The pawl 16 is also provided with a shoulder 20 (Fig. 1) which fits into the annular recess 21 in the face of the collar 18, and holds the pawl against. upward movement. The vtrout face of the collar 18 is also provided with a hearing recess 22 for rotatahlv supporting the extreme rear end of the chuck .7.

When air is admitted to the passage 6 and the piston 1 is given a reciprocatory movement, the parts heretofore described as cooperating give the chuck and drill steel slidahly carried therein a rotary stepbystep movement in the following manner. The engagement between the pawl 16 and the piston 4 secures an oscillatory movement of the pawl. 'lts teeth engage the teeth of the ratchet,w11eel 13 and cause the ratchet wheel to' rotate a slight dislance, thus turning the chuck 7 and the drill steel carried thereby by reason of the inter-engaging lugs 15 and 12. On the move ment of the pawl in the reverse direction its teeth ride over the teeth of the ratchet wheel, the spring 8 permitting the move ment of-the ratchet wheel to the right ne cessitatcd by this camming action. The spring then causes the teeth to snap back into engagement in readiness for another forward movement.

It will be seen that the apparatus is compact and simple, and also that it may be easily assembled and disassembled upon the removal of the end easing member 23 (Fig. 1), such end casing member being held in position by the longitudinally-extending bolts hereinafter described. The use of the plurality of iuterengaging teeth upon the pawl and ratchet insures positive action and give the parts a relatively long period of life before replacement is necessary. The single spring 8 performs the dual function of maintaining the chuck. yieldingly in its forward position, and of securing engagement between the ratchet wheel and pawl, and the numbe' of parts throughout is reduced toa minimum. The spring 8 is advantageously arranged, since both the collar 9 and the Washer 19 move with the chuck and spring, and there is no wear such as would occur if the spring bore at one end against a. non-rotating part.

In order to support the end casing mem ber 23 yieldingly, the bolts B l. shown in Fig. (3 are employed. These bolts extend through the flanges 251, 20 and 27, carried by the members 1, 28 and 23 respectively (Figs. 1 and (3). interposed between the tlauge .25 and the heads of the bolts are the compres sion springs 29, a recess I)? being provided in the casing t for such springs. The heads of the bolls con"; opposite ubutnients ill while the nuts 32 come opposite the abutments $33 so that when the. bolts are held by the springs in the position illustrated in Fig. (3, neither the bolts nor the ends can turn. The arrangen'ient, including the springs therefore provides a means whereby the accidental disengagement of the bolts and nuts is prevented and also whereby the end casing member 23 is yieldingly supported against longitudinal movement. This latter function is more or less important in protecting the parts against injury due to the impact of the hammer piston in case the drill slot is too far forward to take the inn pact of the piston.

In order to disengage the bolts and their nuts 32, the casing 1 may be supported in a visc and the heads of the bolts forced to the right by any desired means, which movement carries the nuts 32 forward to such a point that they clear the abutmcnts 33 and may therefore be unscrewed. The clearance spaces 30 would also permit of the rotation of the heads of the bolts if the nuts 32 were held in their forward position by wedging 11 @ans interposed between the nuts and the flange 27. The bolts might also be obviously reversed in position if desired, although the arrangement shown is the prefer-red one.

By reference to Figs. 5 and 7 it will be noted that the handle 84 extending through the rear end of the casing 1 lies in parallelism with the piston 4 for rotating the steel. This is of advantage inasmuch as it permits the casing to be placed close to a side wall which would not be the case if the handle 34 were at right angles to the axis of the piston 4, which is the common arrangement. By this arrangement the center line of the drill steel can be gotten within the distance A. (Fig. 53) from a side wall, floor or ceiling adjacent which it is desired to work.

In order to stop the hammer piston 2 in one extren'ie of movement (preferably its rear extreme) the stem 35 is provided (Fig. 5) for controlling the movement of the valve 3(5. The valve 236 controls the admission of fluid to the cylinder in which the hammer piston :3 works, admitting fluid to one end of such cylinder when the valve 36 is in one extreme of movement, and to the other end of the cylinder when the valve is in its other extreme of movement. The stem 33 is held vieldingly in the retracted position shown, by means of the spring 37, but may be pressed forward by the thumb-piece 33, and when in forward position, engages the end of the valve 36 and holds it against movement to the left. This of course arrests the move; ment of the hammer piston 2. Any desired arrangement of ports may be. employed for controlling the piston from the valve 36, the particular arrangeuu-nt; shown n t constituting any part of my invention.

\Vhat I claim is:

l. in combination in a. rock drill, a haminer piston, a rotatable chuck, a drill steel extending through the chuck in slidable but non-rotatable engagement therewith, a piston working transversely of the chuck, a pawl provided with a plurality of ratchet teeth and mounted for oscillatory move ment above the chuck and having engagement with the last mentioned piston, a ratchet wheel encircling the chuck in slidable but lltllld'filii'ttliblt) engagement therewith, and a spring pressing the ratchet wheel longitudinally of the chuck so that its teeth engage the teeth of the pawl.

2. In combination in a rock drill, a hammer piston. a rotatable chuck, a drill steel extending through the chuck in slidable but non-rotatable engagement therewith, a piston working transverstdy of the chuck, a pawl having its front face provided with a plurality of ratchet teeth and having its lower face concaved to tit the top of the chuck for oscillation thereon and having engagement with the last mentioned piston, a ratchet wheel encircling the chuck in slid able but non-rotatable engagement therewith, and a spring pressing the ratchet wheel longitudinally of the chuck so that its teeth engage the teeth of the pawl.

33. In combination in a rock drill, a hammer piston, a rotatable chuck, a drill steel extending through the chuck in slidable but iioicrotata iile engagement therewith, a piston working transversely of the chuck, a pawl provided with a plurality of ratchet teeth and mounted for oscillatory movement upon the chuck and having engagement with the last mentioned piston, a ratchet wheel encircling the chuck in slidable but nonrotatable engagement therewith, and a spring yicldingly pressing the chuck in one direction and the ratchet wheel in the reverse direction so that the teeth thereof engage the teeth of the pawl.

4. In combination in a, rock drill, a hammer piston, a rotatable chuck, a drill steel extending through the chuck in slidable but non-rotatable engagement therewith, a pisston working transversely of the chuck, a pawl provided with a plurality of ratchet teeth and mounted for oscillatory movement upon the chuck and having engagement with the last mentioned piston, a ratchet wheel encircling the chuck in slidable but nonrotatable engagement therewith, a spring pressing the ratchet wheel longitudinally o the chuck so that its teeth engage the teeth ol the pawl, and guide in ans for the pawl holding it against movement away from the chuck and to the rear.

5. In combination in a rock drill, a hammer piston, a rotatable chuck, a drill steel extending through the chuck in slidablc but non-rotatable engagement therewith, a piston working transversely of the chuck, a pawl provided with a plurality of ratchet teeth and mounted for oscillatory movement upon the chuck and having engagement with he last mentioned piston; a ratchet wheel encircling the chuck and slidable longitudinally thereof, inter-engaging projections on the chuck and ratchet wheel whereby relative rotation is prevented, and a spring for holding the pawl and ratchet wheel in yielding cngag nnent.

6. The combination with a fluid-operated device having a casing, hammer piston, and end casing member, of means for securing the end casing member yieldingly in position comprising a longitudinallyextending nolt extending through portions of the end casing member and the casing and provided with a head and a nut, a spring for holding the bolt against longitudinal movement with when in its normal position as held b respect to the casing, and abutments engaging the sides of the head and nut of the bolt when in its normal position as held by its spring and preventing its rotation, a clear ance space being provided in advance of the abutment engaging the nut to permit its r0- tation when the bolt is forced forward and the spring compressed.

7. The combination with a fluid-operated device having acasing, hammer piston, and end casing member, of means for securing the end casing member yieldingly in position comprising a longitudinally-cxtending bolt extending through portions of the end casing member and the casing and provided with a head and a nut, a spring for holding the bolt against longitudinal movement with respect to the casing, and abutmcnts engaging the sides of the head nut of the bolt its spring and preventing its rotation, a c earance space being provided in advance of the abutment engaging the head of the bolt to permit the rotation of the bolt when it is forced forward and the sp ing com es.-d.

8. The combination Win a fluid-operated device having a casing, hammer piston, ard cnd casing member, of means for securiin the cnd casing mcmbcr yicldingly in position comprising a hw-ngitudinally-cxtending bolt extending through portions of the end casing member and the casing and provided with a head and a nut, a spring for holding the bolt against longitudinal movement with respect; to the casing, and an abutment engaging the side of the bolt head and preventing rotation thcreot when the bolt is held in its normal position by the spring. a clearance space being provided in advance of the abutment to permit the rotation of the bolt when it is forced forward compressing the sprin 9. In combination in a rock drill, a casing, a hammer piston, a rotatable chuck provided with a collar engaging the casing and held thereby against forward i'novement, a drill steel extending through the chuck in slidable but non-rotatable engagement. therewith, a toothed pawl mounted for oscillation upon the chuck, a ratchet wheel mounted upon the chuck slidably but non-rotatably with respect thereto, and a spring between the said collar on the chuck and the said ratchet for holding it yieldingly in engagement with the said pawl.

In testimony whereof I have hereunto si ned my name in the presence of the two su bscribed witnesses.

' LOUIS \V. GREVF. \Vitnesses:

Geo. H. HALL, J. De Moor. 

